Installation Procedure - UMS T5 User Manual

Installation

3.2 Installation procedure

The following tools are required for installation in the field:

An auger with diameter 5 mm, preferably the UMS
Tensiometer auger kit TBT5

Rule, spirit level, angle gauge, marker pen

Minute book and camera for documentation of site and soil
profile

Perhaps PE-plastic bags for taking soil samples from the site
1. Drill a hole with the required diameter and depth. Mark the
installation depth on both auger and T5 shaft.
2. If the hole's diameter is larger than 5 mm mix a paste of water
and grinded soil material.
3. Connect the T5 to a readout device, for example a data logger
for continuous measurements or the INFIELD7 handheld device
for spot readings.
During the installation the Tensiometer reading has to be
controlled at any time. Especially in wet, clayey soils a high
pressure might develop while inserting the T5. A pressure of over
2 bar will destroy the pressure transducer. Stop or slow down the
insertion to allow pressure relieve.
4. If you use a slurry paste pour it into the hole.
5. Pull off the water filled rubber cap from the shaft. Do not turn the
cap as this might unscrew the shaft.
6. Gently and steadily insert the T5 down to the mark while
checking the reading.
Never turn the T5 inside the borehole as this might loosen the
shaft.
The less air is inside the cup and the better the soil's conductivity
is, the faster the Tensiometer will respond to tension changes.
7. Put the protection cup on the plug whenever the plug is not
connected. Dirt will reduce the water tightness of the plug.
Remember to put the protective cap back on the plug after taking
spot readings with the INFIELD7.
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